用于实现可印刷单晶纳米光子表面的纳米立方体外延,Advanced Materials

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用于实现可印刷单晶纳米光子表面的纳米立方体外延
Advanced Materials ( IF 27.4 ) Pub Date : 2022-04-09 , DOI: 10.1002/adma.202200364
Anna Capitaine ₁ , Beniamino Sciacca ₁

Affiliation

可以通过胶体合成以低成本获得最高质量的等离子体纳米粒子。尽管在纳米光子器件中集成的潜力很大，但胶体等离子体纳米粒子的几何形状主要限于柏拉图固体。这与通过自上而下的方法获得的纳米结构形成鲜明对比，这些方法为等离子体共振工程提供了无限的能力，但材料质量差，并且对可扩展性的看法令人怀疑。在这里，介绍了一种结合两全其美的方法，通过在接近环境温度的溶液中外延，将单晶金纳米立方体构建块的组件转变为具有任意形状的连续单晶等离子体纳米结构。纳米立方体二聚体被用作纳米反应器模型系统来研究操作中的机制，揭示了纳米立方体角处氧化蚀刻的竞争性氧化还原过程和它们表面的同时异质成核，确保以自限方式填充亚纳米间隙. 将此程序应用于组装在图案化聚 (二甲基硅氧烷) (PDMS) 基板中的纳米立方体阵列，它能够获得可快速集成到设备中的可印刷单晶纳米天线阵列。这可能导致在工业产品中实现最高质量的低成本纳米光子表面。确保以自我限制的方式填充亚纳米间隙。将此程序应用于组装在图案化聚 (二甲基硅氧烷) (PDMS) 基板中的纳米立方体阵列，它能够获得可快速集成到设备中的可印刷单晶纳米天线阵列。这可能导致在工业产品中实现最高质量的低成本纳米光子表面。确保以自我限制的方式填充亚纳米间隙。将此程序应用于组装在图案化聚 (二甲基硅氧烷) (PDMS) 基板中的纳米立方体阵列，它能够获得可快速集成到设备中的可印刷单晶纳米天线阵列。这可能导致在工业产品中实现最高质量的低成本纳米光子表面。

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Nanocube Epitaxy for the Realization of Printable Monocrystalline Nanophotonic Surfaces

Plasmonic nanoparticles of the highest quality can be obtained via colloidal synthesis at low-cost. Despite the strong potential for integration in nanophotonic devices, the geometry of colloidal plasmonic nanoparticles is mostly limited to that of platonic solids. This is in stark contrast to nanostructures obtained by top-down methods that offer unlimited capability for plasmon resonance engineering, but present poor material quality and have doubtful perspectives for scalability. Here, an approach that combines the best of the two worlds by transforming assemblies of single-crystal gold nanocube building blocks into continuous monocrystalline plasmonic nanostructures with an arbitrary shape, via epitaxy in solution at near ambient temperature, is introduced. Nanocube dimers are used as a nanoreactor model system to investigate the mechanism in operando, revealing competitive redox processes of oxidative etching at the nanocube corners and simultaneous heterogeneous nucleation at their surface, that ensure filling of the sub-nanometer gap in a self-limited manner. Applying this procedure to nanocube arrays assembled in a patterned poly(dimethylsiloxane) (PDMS) substrate, it is able to obtain printable monocrystalline nanoantenna arrays that can be swiftly integrated in devices. This may lead to the implementation of low-cost nanophotonic surfaces of the highest quality in industrial products.

更新日期：2022-04-09

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